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Annotation of 43BSD/usr.lib/learn/editor/L54.1b, revision 1.1

1.1     ! root        1: #print
        !             2: The fact that the system remembers the last regular expression
        !             3: it had is particularly useful when the regular expression is
        !             4: complex.  Suppose, for example, you know that the
        !             5: words "first" and "second" appear on the same line and you wish
        !             6: to delete them and everything between them.  You could write
        !             7:   /first.*second/s/first.*second//p
        !             8: but isn't it easier to do
        !             9:   /first.*second/s///p
        !            10: Edit the file "passage"; the words "twentieth" and "impending" appear
        !            11: on the same line.  Replace them and everything between
        !            12: them by the word "impending" (i.e. delete from "twentieth"
        !            13: up to but not including "impending").  One command, if you can.
        !            14: Then rewrite the file and type ready.
        !            15: #create Ref
        !            16:    America's rise to world power is a consequence of the nation's
        !            17: geographic position, natural resources, and dynamic energy.  For
        !            18: the first century and more of national history, however, continental
        !            19: expansion and internal developments largely absorbed the energies
        !            20: of the American people.  Every dictate of public interest emphasized
        !            21: the importance of avoiding all entanglements that might involve the
        !            22: young republic in foreign rivalries and foreign wars.  Only with the
        !            23: impending shifts
        !            24: in the European balance of power, and the growth of American economic
        !            25: and industrial strength create a situation that made impossible a
        !            26: continued aloofness from international affairs.
        !            27: #create passage
        !            28:    America's rise to world power is a consequence of the nation's
        !            29: geographic position, natural resources, and dynamic energy.  For
        !            30: the first century and more of national history, however, continental
        !            31: expansion and internal developments largely absorbed the energies
        !            32: of the American people.  Every dictate of public interest emphasized
        !            33: the importance of avoiding all entanglements that might involve the
        !            34: young republic in foreign rivalries and foreign wars.  Only with the
        !            35: twentieth century did a rapidly contracting world, impending shifts
        !            36: in the European balance of power, and the growth of American economic
        !            37: and industrial strength create a situation that made impossible a
        !            38: continued aloofness from international affairs.
        !            39: #user
        !            40: #cmp passage Ref
        !            41: #log
        !            42: #next
        !            43: 55.1a 10

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